In entering Schedule K-1, Turbotax wants the amount of section 179 expense that is allocated to each state. What does the State Abbreviation "XX" mean?

You might want to contact Support (link below) during regular business hours regarding this issue as it may be a bug in the software.

https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632

I have the exact same issue and I have been banging my head against a wall because of it.